Creatures in Axolotl Tank

[KirbyandMudkip11]

Hello! So I’ve noticed for a while that i’ve had these little circular creature things show up in my tank. I’m not sure what they are but Ive been squashing them all and more just keep coming. Can someone tell me what they are and if they are any threat to my axolotl?

 

[wolfen]

Hello! So I’ve noticed for a while that i’ve had these little circular creature things show up in my tank. I’m not sure what they are but Ive been squashing them all and more just keep coming. Can someone tell me what they are and if they are any threat to my axolotl? View attachment 92898

they look like limpets, quite harmless and will help clean the tank.

 

[JM29]

Probably genus Ferrissia, a limpet-like pulmonate snail akin to ramshorns.
In Europe, we have Ferrissia fragilis but I wouldn't risk a species-level identification.

Good for the aquarium, as Wolfen said.